This video shows you how to calculate a person's age given that person's birth date.
Here age is calculated with a simpler method:
1. We subtract the birth date from today's date to get the number of days between the two dates
2. The difference is divided by 365.25, the average number of days in a year, to get the approximate number of years.
3. Finally we use the function rounddown() to round the result down to a whole integer.
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